Corning® 7980 Fused Silica
Corning® 7980 is a very pure, non-crystalline silica glass. It features very low thermal expansion and excellent optical qualities, including very high transmission in the UV spectrum.
Features
- Excellent optical properties
- Low thermal expansion
- High UV transmission
Applications
- Optical windows
- High temperature view ports
Dimensions
- Thicknesses: 1.6mm
- Sizes: Up to 6.5” x 6.5” (165.1 x 165.1mm)
Optical Properties
Index of Refraction @ 589.3nm
1.45840
Thermal Expansion
0 – 200 °C (32 – 392 °F)
5.7 x 10-7/°C
Electrical Properties
Log10 Volume Resistivity (250°C, 482°F)
11.8 ohm*cm
Mechanical Properties
Density (25°C) ρ
2.201 g/cm3
137.4 lb/ft3
Young’s Modulus Ε
72.7 GPa
10.5 Mpsi
Poisson’s Ratio μ
0.16
0.16
Knoop Hardness HK0.1/20
522 kg/mm2
Shear Modulus
31.4 GPa
4.55 Mpsi
Viscosity
Softening Point (107.6 poises)
1585 °C
2885 °F
Annealing Point (1013 poises)
1042 °C
1908 °F
Strain Point (1014.5 poises)
893 °C
1639 °F
Corning® 7980 Fused Silica
